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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 27, 2024
Dec. 29, 2023
Sep. 27, 2024
Income Taxes      
Income tax expense (benefit) $ 178 $ (1,105)  
Income tax expense relating to revaluation of deferred tax assets resulting from corporate tax rate decrease in non-U.S. jurisdiction $ 13    
Income tax benefit associated with a ten-year tax credit obtained by a Swiss subsidiary   $ 874  
Duration of income tax benefit associated with a tax credit obtained by a Swiss subsidiary 10 years 10 years 10 years
Income tax benefit relating to revaluation of deferred tax assets resulting from corporate tax rate increase in Switzerland   $ 262  
Income tax benefit associated with the tax impacts of a legal entity restructuring   118  
Non-income tax expense related to a legal entity restructuring   $ 4  
Unrecognized income tax benefits, approximate amount that could be resolved in next twelve months $ 20